When land located outside existing director divisions is included in an irrigation district such land shall thereby be added to the nearest director division, except that where added lands are adjacent to two or more director divisions, the common boundary lines between the divisions shall be extended in a straight line so as to include the new lands in such divisions: PROVIDED, That where the provisions of this section cannot be applied due to geographic limitations, the procedures provided for in RCW 87.04.050 shall apply.